Free originality check · Runs in your browser
Plagiarism Checker: Find Copied Sentences Online or Compare Two Texts
Paste your text and the tool picks its most unique sentences, so you can search each one on Google as an exact phrase in one click. Or paste a source and your version to see every matching passage highlighted, side by side.
- Paste or upload your text
- Search the picked sentences
- Quote, cite or rewrite matches
Your text
Your report
Sentences to check
Open a search for each sentence. If a result shows the same words in bold, mark it Found it and paste the link. If nothing matches, mark it Not found.
Your text, highlighted
- Picked, not checked yet
- Found online
- Not found
- In quotation marks (skipped)
Also noticed
Matching passages
Longest firstBoth texts, highlighted
- Words found in both texts
- In quotation marks (not counted)
Source text
Your text
Privacy: your text stays in this browser. Search links send only that one sentence to the search engine you pick. Automatic search sends only the picked sentences to Google Gemini (through our server, or straight from your browser with your own key). Nothing is saved; refreshing the page clears it.
What this checker does, and what it doesn't
Many free checkers show a big "plagiarism %" without telling you where it came from. Here is exactly how this one works.
✓What it does
- Picks your most unique sentences, spread across the whole text, and skips anything already in quotation marks.
- Builds exact-phrase searches for Google, Bing and DuckDuckGo, so you see the real search results yourself.
- Can search for you: Google Gemini searches Google, and our server opens each page it finds to confirm the wording before calling it a match.
- Compares two texts word by word and highlights every passage of 5 or more words they share, with a real percentage.
- Gives you a report to copy or download, with the links you found.
✕What it doesn't do
- Search private databases. Student papers, paid journals and books that aren't online can't be checked here; schools use tools like Turnitin for that.
- Check every sentence on the web. It checks the sentences most likely to be copied, so a "not found" result lowers the risk but doesn't prove the text is original.
- Catch heavy rewording. Exact-phrase search finds copied wording. A copied idea in new words still needs a citation, and no tool can judge that for you.
- Detect AI writing. AI detectors often flag human writing, especially from non-native speakers, so we don't show a guess.
- Make up a score. You only see numbers the tool actually counted.
What each result means
How to read the search results and the report, with an example of each.
Found online
A search result shows the same run of words in bold, in the same order. Someone published this wording before you, or you copied it.
The result's snippet repeats your sentence word for word.
Not found
No result repeats the sentence. That's a good sign for this sentence only; the rest of your text wasn't searched.
Results only share a few common words, like "climate" and "India".
Your own page shows up
If the match is your own blog post or your earlier assignment, it's still a match. Reusing your own published work without saying so is called self-plagiarism in schools and journals.
The match is your own website.
Common phrases
Short, everyday phrases appear on millions of pages and aren't plagiarism. That's why the tool searches long, specific sentences.
on the other hand
the new cooling tower cut the plant's water use by a third in just two years
Match percentage (compare mode)
The share of words in your text that sit inside a passage also found in the source. Quoted text is left out when the box is ticked.
Under 10%: usually shared names and short phrases.
Over 25%: long passages copied from the source.
Quoted text
Words inside quotation marks are skipped, because a quote with a citation is allowed. Make sure every quote really does have one.
The survey found that "most wells in the district are now dry by April" (Patel, 2023).
Fixing a copied sentence
A student's sentence found word for word online, and two honest ways to fix it.
Before
Groundwater levels in north Gujarat have dropped so sharply that many farmers now drill borewells deeper than 300 metres.
- Copied word for word from a published survey
- No quotation marks
- No source named
After
As a 2023 water survey reported, "groundwater levels in north Gujarat have dropped so sharply that many farmers now drill borewells deeper than 300 metres" (Patel, 2023).
Or in your own words: Farmers in north Gujarat are drilling far deeper than before, some past 300 metres, as groundwater runs low (Patel, 2023).
- Quoted exactly, or rewritten in new words
- The source is named either way
Is it plagiarism? A cheat sheet
The common cases, and what to do about each one.
| What you did | Plagiarism? | What to do |
|---|---|---|
| Copied a sentence without quotation marks | Yes | Add quotation marks and name the source, or rewrite and cite |
| Changed a few words of someone's sentence | Yes, usually | Rewrite it fully in your own words and cite the source |
| Put someone's idea in your own words | Yes, without a citation | Name where the idea came from |
| Quoted with marks and a citation | No | Keep quotes short; most of the text should be yours |
| Wrote common knowledge | No | Facts like "Delhi is India's capital" need no citation |
| Reused your own old essay or post | Often, in schools and journals | Ask first, or say where it was published before |
| Translated someone's text | Yes, without a citation | Cite the original, even when it's in another language |
How to check your text for plagiarism
Paste or upload your text
Paste it in the box, or upload a Word (.docx) or text file. For a PDF, open it and copy the text across.
Let the tool pick sentences
It chooses the longest, most specific sentences from every part of your text. Generic sentences and quotes are left out.
Search each sentence
Press Google, Bing or DuckDuckGo. The sentence is searched in quotation marks, which asks for those exact words in that order.
Mark what you find
If a result shows your words in bold, mark it Found it and paste the link. If not, mark it Not found. The report and highlights update as you go.
Fix every match
Put copied wording in quotation marks with the source, or rewrite it in your own words and still name the source.
Compare against a known source
If you used a particular article or book, switch to Compare two texts and paste both, to catch passages you kept too close.
Frequently asked questions
How does this plagiarism checker work?
It splits your text into sentences, skips quotes and short or generic lines, and picks the most specific sentences from every part of the text. Each one gets a search link that looks for those exact words, in that order, on Google, Bing or DuckDuckGo. If a result repeats your sentence, that wording is already online. In Compare two texts, it finds every run of 5 or more words that both texts share.
Why doesn't it give one plagiarism percentage for my whole text?
Because it would be a guess. A web check can only say which of the searched sentences were found online, so the report shows exactly that: how many sentences were checked and how many matched. Compare two texts does show a real percentage, because there it can count every shared word.
Is this as accurate as Turnitin?
No, and it doesn't try to be. Turnitin and similar tools compare your work with private databases of student papers, journals and books that aren't on the open web. This tool checks what search engines can find, which is enough to catch text copied from websites, blogs and Wikipedia, the most common sources.
Can it tell if my text was written by AI?
No. AI detectors guess from writing style, and they often flag text written by people, especially non-native English speakers. We don't show a guess that could get someone wrongly accused. Exact-phrase search does find AI text that repeats published wording, like any other copied text.
Is my text stored or shared?
No. Picking sentences, comparing texts and reading files all happen in your browser, and nothing is saved; refreshing the page clears it. A search link sends only that one sentence to the search engine you chose. Automatic search sends only the picked sentences, never the rest of your text, to our server and Google Gemini; Google's free API may use requests to improve its products. With your own key, the sentences go straight from your browser to Google.
Which files can I upload?
Word files (.docx) and plain text (.txt or .md), up to 5 MB, read in your browser. For a PDF or Google Doc, open it, select the text and paste it in the box. Old .doc files need to be saved as .docx first.
Does duplicate content hurt my website on Google?
Google doesn't penalise a site just because some text also appears elsewhere; it picks one version to show in results, often the original. But pages built mostly from copied or scraped content can be ranked lower or removed under Google's spam policies, and copying can break copyright law. Original writing is the safe choice.
Is it free, and is there a limit?
Yes, it's free with no sign-up. You can check up to 25,000 characters (about 4,000 words) at a time, and the search links and compare mode have no limit. Automatic search allows 5 checks an hour per visitor; after that, add your own free Gemini key or use the search links.
What to do next
Checking originality comes after the draft and before you publish or submit. Here's the whole path, with a tool for each step.